起重机类负载：这类负载的特点是启动时冲击很大，因此要求变频器有一定余量。同时，在重物下放肘，会有能量回馈，因此要使用制动单元或采用共用母线方式。

C:不均行负载：有的负载有时轻，有时重，此时应按照重负载的情况来选择变频器容量，例如轧钢机机械、粉碎机械、搅拌机等。

D:大惯性负载：如离心机、冲床、水泥厂的旋转窑，此类负载惯性很大，因此启动时可能会振荡，电动机减速时有能量回馈。。应该用容量稍大的变频器来加快启动，避免振荡。配合制动单元消除回馈电能。

2.用户应根据生产机械的具体情况选购

如果是挖土机，应选择具有转矩控制功能的高功能专用型变频器，因为这种变频器低速转矩大，静态机械特性硬度大，不怕负载冲击，可以通过加大电动机和变频器容量的办法，提高低速转矩;

如果是控制压缩机，由于压缩机的转矩特性比较复杂，尤其是起动转矩很大，因此应选择转矩特性好和具有限流功能的高性能矢量变频器。如果是造纸、化纤设备用，应选择高精度、高响应特性的闭环矢量变频器。

Allen Bradley X-310369 Potentiometer Type J U-50K-OHM

Allen Bradley W52 Thermal Overload Heater Element

Allen Bradley W49 Overload Heater Element

Allen Bradley W48 Overload Heater Element

Allen Bradley W45 Thermal Overload Heater Element

Allen Bradley W43 Thermal Overload Heater Element

Allen Bradley W42 Overload Heater Element

Allen Bradley W41 Thermal Overload Heater Element

Allen Bradley W40 Overload Heater Element

Allen Bradley W36 Overload Heater Element

Allen Bradley W35 Overload Heater Element

Allen Bradley W34 Thermal Overload Heater Element

Allen Bradley W34 Overload Heater Element

Allen Bradley W33 Thermal Overload Heater Element

Allen Bradley W33 Overload Heater Element

Allen Bradley W31 Thermal Overload Heater Element

Allen Bradley W30 Overload Heater Element

Allen Bradley W29 Overload Heater Element

Allen Bradley W28 Overload Heater Element

Allen Bradley W27 Overload Heater Element

Allen Bradley W24 Thermal Overload Heater Element

Allen Bradley Proximity Switch 871TM-B10N30-N3, Series A,

Allen Bradley N9 Thermal Overload Heater Element

Allen Bradley N8 Thermal Overload Heater Element

Allen Bradley N6 Thermal Overload Heater Element

Allen Bradley N5 Thermal Overload Heater Element

Allen Bradley N4 Thermal Overload Heater Element

Allen Bradley N35 Thermal Overload Heater Element

Allen Bradley N31 Thermal Overload Heater Element

Allen Bradley N30 Thermal Overload Heater Element

Allen Bradley N3 Thermal Overload Heater Element

Allen Bradley N29 Thermal Overload Heater Element

Allen Bradley N26 Thermal Overload Heater Element

Allen Bradley N25 Thermal Overload Heater Element

Allen Bradley N21 Thermal Overload Heater Element

Allen Bradley N20 Thermal Overload Heater Element

Allen Bradley N18 Thermal Overload Heater Element

Allen Bradley N15 Thermal Overload Heater Element

Allen Bradley N13 Thermal Overload Heater Element

Allen Bradley N12 Thermal Overload Heater Element

Allen Bradley N11 Thermal Overload Heater Element

Allen Bradley 800T-XA7 Ser D Contact Block

Allen Bradley 800T-XA Ser D Contact Block